for Mark Kraus ♥

Get-Age.ps1

function Get-Age {
    [CmdletBinding()]
    param(
        [Parameter(Mandatory)]
        [ValidateScript(
            {
                $_ -lt [datetimeoffset]::UtcNow
            }
        )]
        [datetimeoffset]
        $Birthday
    )

    # Make it UTC if it ain't
    $Birthday = $Birthday.ToOffset(0)

    $current = [datetimeoffset]::UtcNow
    $Years = $current.Year - $Birthday.Year
    $Months = $current.Month - $Birthday.Month
    $Days = $current.Day - $BirthDay.Day
    $Hours = $current.Hour - $Birthday.Hour
    $Minutes = $current.Minute - $Birthday.Minute

    do {
        if ($Months -lt 0) {
            $Years--
            $Months += 12
        }

        if ($Days -lt 0) {
            $Months--
            $Days += 30
        }

        if ($Hours -lt 0) {
            $Days--
            $Hours += 24
        }

        if ($Minutes -lt 0) {
            $Hours--
            $Minutes += 60
        }
    } while ($Months, $Days, $Hours, $Minutes -lt 0)

    [PSCustomObject]@{
        Years   = $Years
        Months  = $Months
        Days    = $Days
        Hours   = $Hours
        Minutes = $Minutes
    }
}